Strain-induced phase-structure of Fe2O3 nanoparticles
Strain-induced phase-structure of Fe2O3 nanoparticles
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DOI：
10.1016/j.jallcom.2018.01.286
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发表时间：
2018-04
影响因子：
6.2
通讯作者：
Hang Zhou;C. Yuan;Zhiwei An;Yong Yang;Keng Xu;Ting Yu;Xingfang Luo
中科院分区：
文献类型：
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作者：
Hang Zhou;C. Yuan;Zhiwei An;Yong Yang;Keng Xu;Ting Yu;Xingfang Luo
选择性合成具有所需相结构的Fe 2 O3纳米材料对于拓宽和提高其工业应用具有重要意义。本文研究了不同退火工艺条件下制备的样品的结构-相转变，试图找到一种简单易行的制备α-和γ-Fe 2 O3纳米粒子的方法，这对氧化铁的设计和应用具有重要意义。高分辨透射电子显微镜、X射线光电子能谱和拉曼光谱分析表明，长时间热退火和快速热退火分别导致α-和γ-Fe 2 O3形成于Al 2 O3基体中。磁性测试结果表明，γ-Fe 2 O3纳米粒子的剩余磁化强度和矫顽力远高于α-Fe 2 O3纳米粒子，这为选择性合成具有所需应变诱导相结构的受限Fe 2 O3纳米粒子提供了一条增强磁性的途径，为Fe 2 O3纳米粒子在磁性纳米器件中的应用奠定了基础。
Selective synthesis of Fe2O3nanomaterials with desired phase-structure is of great importance for broadening and improving their industrial applications. In this paper, the structure-phase transformation in the as-prepared samples with different annealing process is studied, trying to find a facile route to fabricate α- and γ-Fe2O3nanoparticles by inducing external strain in a well control mode, which is of great importance for the design and applications of the iron oxide. The high-resolution transmission electron microscope, X-ray photoelectron spectra and Raman spectra analysis clearly demonstrate that the long-term thermal annealing and rapid thermal annealing can result in the formation of α- and γ-Fe2O3confined in Al2O3matrix, respectively. The magnetic properties display that the residual magnetization and coercive force values for the γ-Fe2O3nanoparticles are much higher than those for the α-Fe2O3nanoparticles, which supplies an enhanced magnetic route by selective synthesis of confined Fe2O3nanoparticles with desired strain-induced phase-structure and paves the ways for the applications of Fe2O3nanoparticles in magnetic nano-devices.